A large storm system to our south on Monday brought rain and snow showers to Iowa. A considerable amount of dry air had to be saturated in order for the rain and snow to reach the ground. The featured graph is of 5 minute NEXRAD base reflectivity and temperature timeseries for Ames. The initial difference between the temperature and dew point begins to narrow once the shower passes overhead. The dew point increases as the air saturates and the temperature decreases as evaporation occurs.

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